specifically, cambridge and the campus of the massachusetts institute of technology. a campus officer has been shot and killed by an unknown gunman. there is a massive, active search going on right now.. cnn is reporting tonight - that one suspect has been apprehended in watertown in connection with the campus shooting. watertown is across the charles river from the school campus. and only a couple miles from mondays tragedy. there are unconfirmed reports of explosions in the area. raising intense concern following mondays explosions. as we know, there is an intense manhunt for the two suspects in monday's bombing. the f-b-i releasing those suspect pictures just today. we have to stress, at this time, there is no confirmation, as to whether these two incidents might be related. tonights shooting happened on the m.i.t campus. the officer was transported to a nearby hospital but did not survive. everyone in boston understandably on edge after monday's tragedy. we will continue following this story and update you, as necessary, throughout the newcast. as we said, today f